Prep the avocados: Halve, pit, and scoop the flesh into a blender or food processor.
Choose avocados that yield slightly to gentle pressure and have no brown spots.
Add dry ingredients: Add cocoa powder, sweetener, and a pinch of salt. If using espresso powder or spices, add them now.
Blend with liquids: Pour in vanilla and 3 tablespoons of non-dairy milk. Blend until mostly smooth, stopping to scrape down the sides.
Adjust texture: If it’s too thick or grainy, add 1 tablespoon of milk at a time and blend again.
Aim for a silky, pudding-like consistency.
Taste and fine-tune: Check sweetness and chocolate intensity. Add a bit more sweetener or cocoa if needed, and blend again. A tiny extra pinch of salt can brighten the flavor.
Chill to set: Spoon into small bowls or ramekins.
Cover and refrigerate for at least 30–60 minutes. The mousse will thicken and flavors will meld.
Garnish and serve: Top with shaved dark chocolate, toasted nuts, or a few berries. Serve cold.